From a technical point of view, analog signals are converted into digital signals during digitization. In the process, discrete-time signals with continuous voltage changes are converted into two-valued digital signals with different digital resolutions.
Depending on the conversion process, the digital signals consist of 4, 8 or more bits, with one bit representing a two-valued, dimensionless state. The conversion of an analog to a digital state takes place in an analog-to-digital converter, or A/D converter for short. Digitization requires an electrical quantity. Before digitization, the analog signal is sampled by means of sampling, its value is briefly recorded, converted into a digital signal by means of quantization, and transferred to the corresponding electronic circuit for further digital processing.
When we speak of digitization, we generally mean the conversion and further digital, information processing, storage and output of the digital signals. This process of digitalization is taking hold in all areas of life, in technology, communication, entertainment, industry, administration and medicine. There are endless examples of this.